Commercial HVAC/R Systems Tune-Up & Troubleshooting: From PM Lists to Callback Prevention - HVAC School

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Commercial HVAC/R Systems Tune-Up & Troubleshooting: From PM Lists to Callback Prevention

By Roman Baugh Jesus Santiago Sam Behncke

January 25, 2026

Master Commercial HVAC/R Systems Tune-Up & Troubleshooting: From PM Lists to Callback Prevention with this comprehensive training session! Learn professional preventive maintenance protocols, systematic troubleshooting methods, and proven strategies to eliminate callbacks.

Key Topics Covered:

Complete PM checklist walkthrough for commercial HVAC systems
Condensate pump cleaning and maintenance procedures
Proper capacitor testing (10% replacement threshold for commercial)
Full system diagnostics for refrigeration equipment
Evaporator coil inspection and cleaning techniques
Door closers, gaskets, and walk-in cooler maintenance
Superheat and subcooling measurements for refrigeration
Defrost settings and controller parameters
Proper documentation and equipment tracking
Using measureQuick for advanced diagnostics
Truck stock management for faster repairs
Professional conduct and customer interaction standards

Pro Tips Included:

Copper antimicrobial trick for condensate pumps
Visual inspection techniques for contactors and capacitors
Refrigeration pressure-temperature relationships
When to quote OEM vs. truck stock parts
Emergency repair prioritization strategies

#commercial #commercial hvac #Condensate #condensate drains #drains #hvac #maintenance #measurequick

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Heat Exchanger Crack Comment – Short #280

byBryan Orr

In this short podcast episode, Bryan responds to a comment we received about cracked heat exchangers and how they were characterized in a recent combustion safety podcast episode.

In reality, heat exchanger cracks counter the effects of the inducer motor. The inducer pulls air through the heat exchanger, but a crack causes the inducer to pull the air from elsewhere, especially once the blower motor comes on. That is a cause of flame rollout and a higher CO measurement.

Induced draft (80%) furnace venting is under negative pressure near the equipment (WRT the air in the room around it). The inducer fan pulls the air through the single heat exchanger, but air isn’t “pushed” out of the flue. That’s because the draft in the flue is greater than the inducer itself.

80% furnaces are also open-combustion units that pull combustion air in from the air around the furnace, and they require access to fresh air. When you have gaps and cracks in the ductwork, the blower comes on and may cause the combustion analysis readings to change briefly. In a 90%+ sealed combustion furnace, the change is very minimal and doesn’t last long; if the numbers vary a lot and are sustained, then that’s an indicator of a cracked heat exchanger.

In any case, if you suspect a cracked heat exchanger and want to quote it, you must be able to find it. Proper combustion analysis and combustion analyzer use and care also matter for accurate cracked heat exchanger diagnosis.

Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool.

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